r10608: update license

[uffi.git] / examples / compress.lisp

diff --git a/examples/compress.lisp b/examples/compress.lisp
index 75d79c4d02ed95ee3c73341f2671db9254bd1743..3f3e838fc182eced393a61d0ced7ea0c2c712342 100644 (file)
--- a/examples/compress.lisp
+++ b/examples/compress.lisp
@@ -7,26 +7,28 @@
 ;;;; Programmer:    Kevin M. Rosenberg
 ;;;; Date Started:  Feb 2002
 ;;;;
-;;;; $Id: compress.lisp,v 1.1 2002/09/30 10:02:36 kevin Exp $
+;;;; $Id$
 ;;;;
-;;;; This file, part of UFFI, is Copyright (c) 2002 by Kevin M. Rosenberg
+;;;; This file, part of UFFI, is Copyright (c) 2002-2005 by Kevin M. Rosenberg
 ;;;;
-;;;; UFFI users are granted the rights to distribute and use this software
-;;;; as governed by the terms of the Lisp Lesser GNU Public License
-;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
 ;;;; *************************************************************************
 
 (in-package :cl-user)
 
-(unless (uffi:load-foreign-library
-        (uffi:find-foreign-library
-         "libz"
-         '("/usr/local/lib/" "/usr/lib/" "/zlib/")
-         :types '("so" "a" "dylib"))
-        :module "zlib" 
-        :supporting-libraries '("c"))
-  (warn "Unable to load zlib"))
-
+(eval-when (:load-toplevel :execute)
+  (unless (uffi:load-foreign-library
+          #-(or macosx darwin)
+          (uffi:find-foreign-library
+           "libz"
+           '("/usr/local/lib/" "/usr/lib/" "/zlib/")
+           :types '("so" "a"))
+          #+(or macosx darwin)
+          (uffi:find-foreign-library "z"
+                                     `(,(pathname-directory *load-pathname*)))
+          :module "zlib" 
+          :supporting-libraries '("c"))
+    (warn "Unable to load zlib")))
+  
 (uffi:def-function ("compress" c-compress)
     ((dest (* :unsigned-char))
      (destlen (* :long))
@@ -58,19 +60,56 @@
            (uffi:free-foreign-object destlen)
            (uffi:free-foreign-object dest)))))))
 
+(uffi:def-function ("uncompress" c-uncompress)
+    ((dest (* :unsigned-char))
+     (destlen (* :long))
+     (source :cstring)
+     (source-len :long))
+  :returning :int
+  :module "zlib")
+
+(defun uncompress (source)
+  (let* ((sourcelen (length source))
+        (destsize 200000)  ;adjust as needed
+        (dest (uffi:allocate-foreign-string destsize :unsigned t))
+        (destlen (uffi:allocate-foreign-object :long)))
+    (setf (uffi:deref-pointer destlen :long) destsize)
+    (uffi:with-cstring (source-native source)
+      (let ((result (c-uncompress dest destlen source-native sourcelen))
+           (newdestlen (uffi:deref-pointer destlen :long)))
+       (unwind-protect
+            (if (zerop result)
+                (uffi:convert-from-foreign-string 
+                 dest
+                 :length newdestlen
+                 :null-terminated-p nil)
+                (error "zlib error, code ~D" result))
+         (progn
+           (uffi:free-foreign-object destlen)
+           (uffi:free-foreign-object dest)))))))
 
 #+examples-uffi
 (progn
   (flet ((print-results (str)
           (multiple-value-bind (compressed len) (compress str)
+            (let ((*print-length* nil))
               (format t "~&(compress ~S) => " str)
-              (dotimes (i len)
-                (format t "~X" (char-code (char compressed i))))
-              (format t ",~D" len))))
+              (format t "~S~%" (map 'list #'char-code compressed))))))
     (print-results "")
     (print-results "test")
     (print-results "test2")))
 
+#+test-uffi
+(progn
+  (flet ((test-compress (str)
+          (multiple-value-bind (compressed len) (compress str)
+            (multiple-value-bind (uncompressed len2) (uncompress compressed)
+              (util.test:test str uncompressed :test #'string=
+                              :fail-info "Error uncompressing a compressed string")))))
+    (test-compress "")
+    (test-compress "test")
+    (test-compress "test2")))
+
 ;; Results of the above on my system:
 ;; (compress "") => 789c300001,8
 ;; (compress "test") => 789c2b492d2e1045d1c1,12